Saw frame



July 25, 1933. G. J. BLUM 1,919,323

SAW FRAME Filed May 27. 1951 which is mounted 'the saw frame-1 carrying a frame which is'mounted ointhe, braclziet `,1 2

Patented `July 2'5, 1933 GEORGEJ. BLUM, OF OHI'CAGO, ILLINOIS, AssrGNoR To Aar/ISTR ONG-BLUM MFG. y coi, on

OHICAGQ'ILLINOIS, A CORPORATION or ILLINOIS 'Y Y saw F Application inea may 27,1

@The invention relates generally topow'er hacksawsand more particularlytoa saw frame for such a hacksaw.

The general objectv ofthe invention is to provide'a newand improved saw'frame and supportingy means ftherefor such thatY the frame may be easi-lyreciprocated either when `idling Vor when under av heavy Vfeeding pressure.

Another Objectis toprovide'a saw frame of this character which is `eilectually supported against side thrusts laterally of the direction of feed. v

A further object is to providea saw of this character havingsupporting means in the form of lubricated Vantifriction bear,-

Infrs. Y .y

Ztill anotherobjectA is to provide a saw frame of vthis character in which the supporting bearings are eifectuallyenclosed to prevent the entrance of dirt therein.`

Other objects and advantages will become apparent from the lfollowing ldescription taken in connection with the accompanying drawing, in which:

Figure 1 is aperspective view, on a re .duced scale, of a power hacksawhaving a saw frame embodying the features of Vthe 1n- 'vent1on.

E ig. 2 is a perspective view, partially bro ken away, `of the saw frame.

F ig. 3 is air-enlarged vertical section talren on the line 3-3 of Fig. 2.v Fig. 4 `is a fragmentary .sectional View taken on the line 4-4'0 Fig. f

Fig. 5 is a Afragmentary perspective viewV 'of a part of the device; i A saw vframe embodying the Afeatures of the invention forms apart of a power hacksaw `(Fig.V 1) such as that disclosed and claimed in my copending application, Serial No.v 479,268 filed September v2,1930.V YThe hacksaw shown ytherein comprises, brieiy, 4a base supporting an upwardly extending column 11 carryinga yhorizontally extending bracket or support 12 comprising' a thin elongated plate ofV substantial widthA upon saw blade 13 for reciprocationrelative thereto. The work to be cut is-clamped on the base 10 and a relative vfeeding movement is effected between the blade landtheV work piece. v f 'r t The present invention provides av saw RAME 1931. 'serial No. 540,325.rv

through the medium of a slide member,l rigid with 'the bracket, and fantifriction bearlng.

`elements arranged, to travellengthwise of the slide and cooperatingtherewith to support'andguide the frame with arolling'ac-y tion, To thisend, the frame compriseszan elongated body 15 in the form of a stiff hol# lowcasing of rigid Vcast metal and relatively` light in weight to permithigh speeds, of re-y ciprocation with downwardlyv extending Iarms 1G forming `a vU-shape with, the casing to` which the saw blade 13 may Abe v secured by means placinggthe blade/, under tension.

The hollow body 15l is relatively thin, elongated'and of substantialwidth, and isadapt-V `edfto receive witliinit l af-supporting bar 17 of a length substantiallyvlessthanthefcas ing and forming theslidef member, which f bar is rigidly but detacliablysecured to the bracket 12 as by .bolts18fk The ,c'asngcomprises anouter side wallV and opposeded-ge and end'walls, and the blade 13 is disposed substantially in a median plane'between op- `posite sidesof .the casing, The bolts18a r permit the casing and the slide with the bearA ings therebetween to be assembled as.` a unit and then mountedl on the bracket.

While the frame of the machineillustrated herein isr disposed for horizontal reciprocation, it isfconteniplated Vthat the invention may be embodied in a vertical reciprocation. 1

t The antifriction `bearing elements are. infY sets and are mounted between theIupper and Vlower edges of the slide 17 and the adjacentv upper and lower walls of the body'l' adj athesef'elements are 'arranged `in foursets toprovidle ytwo longitudinally Y spaced upper bearings 'y and two longitudinally spaced lower bear-V cent the ends yofthe slide 17 and ings. Each `of said bearings vcomprises -an outwardly facing raceway 18` secured 1nv a posed inwardly facing raceway 2O is secured in a corner formed by an 'edge andthe L! side wall offthe body 15i as by screws21"and to W ygroove in the slide as by screws 19, and an opis in closely space'drelation tol the raceway two suchv balls being '18; Interpo'sedrbetween each"pairforace--V Y ways 19, 20 "and iitting snugly therebetween Y f, n.

shown-in the present instance. `The bear-i ings are disposed withtheir centers `s1ibstan-Av i tiallyA in the median plane of .the` casing,

vwhich induces the lblade 13; It vWin'tetb- .nof i" the bearings are spaced apart vertically as well as longitudinally so that theframe, whileA CTI . ways are made V-shaped in form.

supported for free and easy reciprocation, is also'effectually guidedso'as to be held firmly against side thrusts. In order better to sustain such si le thrusts, the grooves in the race- Thus, the bearings resist stresses `at varying points in the plane of reciprocation and transversely thereof. f

The invention' also includes means for retaining the balls 22 within their respective raceways and'in spaced relation to each other in a manner such as to permit the balls to travel,longitudinally in the raceways, while preventing Vthem from working `out ofthe ends of raceways. As shown inthe drawings, this means. comprises strips of metal tlg-extending. one along each edge of the slide 17 between Athe raceways.V Each strip 23 is perforated adjacent each end to receive freely the balls 22, the holes being spaced to hold each pair of balls in spaced relation to' each other. e

Y `In the middle portion of 'each strip 23 is an abutment or stop member comprising preferably a block 2i secured to the strip 23 as by rivets. lVhen the frame is at either end of its stroke, the block 24 is adapted to abut against the ends ofthe adjacent iaceways20,

I thus limitingthe range of travel of the balls 1 holes therethrough and shaped. to wipe so as to maintainthem-in their proper longibearings,l a plurality of oil-retaining felt pads 25are secured in the'vstrips 23by being wedged in the surfaces of the grooves in the raceways. In the present embodiment, the pads 25 are positione'd.between the pairs ofballsv22 and thus serve tolubricate each bearing.

` p the casing.

AThe hollow body is closed tol prevent the Ventry'of dirt and grit intofthe bearings, by

means of a removable cover plate 26 which is securedn over the open side of the hollow body'l and, in edect, constitutes'a'part of This plate is closely adjacent the slide and is centrally apertured, as at 27,

:to permit the attachment of the slide 17 *toV the bracket l2 and the reciprocation of the body'l relative to the slide. The opening 27 is, however, of less width andy length than the slide and is closed by the bracket l2 and the slide 17 overlapping the cover plate 26. VFrom the above description, it will be apparent that I have provided a saw framel which may be easily reciprocated under all operating conditions. Whenthe-sawis beingfed toward the work'but not yet in contact therewitln'the bearings along the upper Vedge of the slide 17 support the weight of the Vframeand eliminate friction therebetween.

lVhen the saw is cuttingfunder a heavy feeding pressure, the bearingsalong the .lower length `having at its oppositeedges-outwardly.fac-` ing raceways in closely spaced relation to and'tend to be forced laterally,the vertically spaced bearings, coacting with the V-shaped grooves, guide the frame accurately and prevent any lateral movement thereof.

I claim as my invention: Y

l. In a power hacksaw, the combination of a support Aand a reciprocable saw-carrying frameA having a relatively-thin.elongated casing of substantial width and having inwardly facing raceways at opposite-'longitudinal edges, a thin elongated slide member of a substantially less than saidcasing and said inwardly facing raceways so as toform sets of raceways vnear opposite edges of the casing, a plurality of anti-frictionbearing elements ofsmall diameter fitted snugly between each set .of `racewaysand engaging therewith so as to resist stresses both inthe plane of reciprocationV of the saw frame and transversely, thereof, and means rigidly but detachably securing said slide member to said support, said casing having 'an yelongated 4the saw should strike a hard spot in the work .K

opening in one wall to expose the surface of the slide which is secured to the support and to permit reciprocation of the saw frame, land said slide having one face'vdisposed closelyV adjacent said opening to close the saine.

2. In a power haclrsaw,

substantial width and vhaving inwardly fac'- ing raceways a thin elongated lslide member of a` length less than said casing and'having at its opposite edges outwardly facing raceways in means for rigidly but detachably securing MA v said slidermember to saidlsupport, said'casingv including -a [cover-plate detachably secured to one side thereof and having an elongated opening of a lengthV substantially less at Aopposite, longitudinal edges,-

h thecombination of. r a support, a reciprocable saw-carrying frame y having a relatively thin elongated casing of 1- ieg; i

than said slide memberl and of a width also u less than said slide member, said opening serving to eXpose'the portion of the slide member `which is secured to said support and permitting ofreciprocation of the saw frame,

and said slide hacksaw, the combination ofr y Y member having one face disp posed closely adJacent said opening to close t CTI ed casing also of substantial width and hav-i ing inwardly facingraceways at opposite lon.

ing raceways iniclosely spaced relation' to said inwardly facing raceways of the casing so as to form sets of raceways near opposite edges ofthe casing, a plurality of anti-fric tion bearing elements of small diameter fitted snugly between each set of raceways and spaced apart longitudinally of the raceways,

said bearing elements cooperating with said raceways to resist stresses both in the planeI of reciprocation of the saw frame 'as well as transversely thereof, and means for rigidly but detachably securing said slidevto said gated opening in one Wall through which `the slide member is connected to said supporting plate, said opening beingV smaller in size than said slide member with the outer face of the slide membery disposed closely adjacent to and overlapping the inner edges of said opening, and said supporting plate also being of a size larger than said opening and overlapping the outer edges thereof. v

4. In a power hacksaw, the combination of a support, a lreciprocable saw-,carrying frame having a relatively thin elongated casing of substantial width and a pair of arms projecting from opposite ends of the casing adapted to support a saw blade at their free ends with the saw blade disposed substantially in a median plane between op,-

posite sides of the casing, said casing having inwardly facing `V-shaped raceways adja cent the ends of opposite longitudinal edges with their centers disposed substantially in said median plane, a thin elongatedslide member of a length less than said casing and having at its opposite edges outwardly facing raceways in closely spaced. relation to said inwardly facing raceways so as to `form sets of raceways near opposite edges of the casing, a plurality of anti-friction bearing balls fitted snugly `between the raceways and spaced apart longitudinally thereof, Vsaid bearing balls cooperating with said races" ways to resist stresses both at varying points in the plane of reciprocation of the saw frame and transversely thereof, and means for mounting on said support the frame and slide member assembled vas a unit.

5. In a power liacksaw, the combination of a slide member comprising` a rigid elongated block of substantial width, an elon gated reciprocable casing of a width and thickness greater than said block and including a rigid casting havingan outer side wall and opposed edge and end walls and a cover plate detachably secured to said casting, racewaystted into said casting intohtheA corners formed bysaid edge and side Walls, vmeans securing 'said raceways `in positionl in the casting, said block having grooves in 'its opposite longitudinal/edges', inner raceways fitted into said grooves inthe block and rigidly secured thereto, and anti-friction bearing elements fitted snugly betweenthe sets of-, raceways thus formed, said bearing elements and the cooperating raceWays be'- ing shaped to resist lateral stresses as well as'stressesinthe plane of reciproeation vo'f the casing.

6. Ina power hacksaW, the combination Vof a support mountedffor movement toward and from. the Work, a ll-shaped saw frame having a thin lelongated yoke member of Q n substantial Width and rigid depending arins supporting plate, said casing having an elonat opposite` ends of the yoke member adaptyed tosupport a saw blade at-their free ends, y

member and :spaced apartpinthe direction' of reciprocation', inner -raceways rigidly ineunted at one side of said support in said cutting ing V-shaped bearing surfaces in opposed relation to said inwardly facing surfaces of the outer raceways, bearing balls littedsnugplaneand providing outwardly facly between theopposed V-shaped bearing surfaces, and means Vfor* retaining the bear ing balls inposition in theirvrespective race- Ways. y y

7, In a powerV driven lliacksavv, a blade carrying frame4 comprising a vrigid elon;n gated casing of substantial width, with an elongated opening in one side, and ,means reciprocably supporting saidframe and ee,-

gacting. with said casing `to vmaintain said opening closed in the reciprocation ofthe frame, said means including anti-friction bearings spaced apart longitudinallyvof the 'los casing and also in the" cutting Vplane and y adapted to .resist strains both and transversely thereof;

8. In a power drivenhacksaw, a blade carrying frameihaving a rigid'elongated casing of substantialwidth,with an'elongated lopening in one Vside, and means reciprocably supporting said `frame including an elongated supporting member having a substantially iiat Vfaceof'a length greater than said opening and operating to maintain said opening closed in the `reciprocation of the frame, and anti-friction bearingsl inthe casing spaced apart longitudinally thereof and also inthe cutting plane and adapted to resist strains both in said plane and transverselythereof. i'

'GEORGE J.v BLUM.

in said plane 

